sTREM2 (soluble Triggering Receptor Expressed on Myeloid Cells 2) is a microglial biomarker that reflects microglial activation in Alzheimer's disease and other neurodegenerative disorders[@ulrich2016].
Overview
TREM2 is a cell surface receptor expressed primarily on microglia in the central nervous system. The soluble form, sTREM2, is generated through shedding of the extracellular domain by proteolytic cleavage. CSF sTREM2 levels provide insights into microglial activity and have emerged as an important biomarker for neuroinflammation in AD and other neurodegenerative diseases[@hickman2023].
Structure and Function
Molecular Characteristics
| Property | Value | |----------|-------| | Gene | TREM2 | | Protein Name | Soluble TREM2 | | UniProt ID | Q9NZC2 (TREM2) | | Molecular Weight | ~25 kDa (soluble form) | | Cell Type Expression | Microglia | | Ligands | Lipids, apolipoproteins, Aβ |
TREM2 Biology
TREM2 plays critical roles in microglial function[@wang2015]:
Phagocytosis: Enables microglia to clear Aβ plaques and cellular debris
Cell Survival: Provides trophic support for microglia
Inflammatory Response: Regulates cytokine production
Metabolic Function: Supports microglial energy metabolism
Synaptic Pruning: Involved in developmental and disease-related pruning
sTREM2 Generation
Proteolytic Processing
sTREM2 is generated through[@wunderlich2013]:
...
sTREM2 (Soluble TREM2)
sTREM2 (soluble Triggering Receptor Expressed on Myeloid Cells 2) is a microglial biomarker that reflects microglial activation in Alzheimer's disease and other neurodegenerative disorders[@ulrich2016].
Overview
TREM2 is a cell surface receptor expressed primarily on microglia in the central nervous system. The soluble form, sTREM2, is generated through shedding of the extracellular domain by proteolytic cleavage. CSF sTREM2 levels provide insights into microglial activity and have emerged as an important biomarker for neuroinflammation in AD and other neurodegenerative diseases[@hickman2023].
Structure and Function
Molecular Characteristics
| Property | Value | |----------|-------| | Gene | TREM2 | | Protein Name | Soluble TREM2 | | UniProt ID | Q9NZC2 (TREM2) | | Molecular Weight | ~25 kDa (soluble form) | | Cell Type Expression | Microglia | | Ligands | Lipids, apolipoproteins, Aβ |
TREM2 Biology
TREM2 plays critical roles in microglial function[@wang2015]:
Phagocytosis: Enables microglia to clear Aβ plaques and cellular debris
Cell Survival: Provides trophic support for microglia
Inflammatory Response: Regulates cytokine production
Metabolic Function: Supports microglial energy metabolism
Synaptic Pruning: Involved in developmental and disease-related pruning
sTREM2 Generation
Proteolytic Processing
sTREM2 is generated through[@wunderlich2013]:
ADAM10/ADAM17 Cleavage: Shedding of extracellular domain
Alternative Splicing: Produces soluble isoforms
Release from Cell Surface: Proteolytic release from microglia
The study of Strem2 (Soluble Trem2) Microglial Biomarker has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
Microglial Activation Pathway
Disease Association
| Condition | sTREM2 Level | Interpretation | |-----------|--------------|----------------| | Healthy | Baseline | Normal microglial function | | Preclinical AD | Elevated | Early microglial response | | MCI-AD | Higher | Active disease-associated microglia | | AD Dementia | Variable | Disease stage dependent | | Young individuals | Lower | Developmental microglial state |
Microglial Activation Pathway
Mermaid diagram (expand to render)
Allen Brain Atlas Resources
[Allen Brain Atlas - Gene Expression](https://human.brain-map.org/) - Search for gene expression data across brain regions
[Ulrich JD, Holtzman DM, TREM2 in Alzheimer's disease: A microglia-specific receptor that opens new avenues for understanding AD pathogenesis (2016)]([DOI:10.1016/j.neuron.2016.06.032](https://doi.org/10.1038/s41583-023-00668-4)
[Wang Y, Cella M, Mallinson K, et al, TREM2 lipid sensing sustains the microglial response in an Alzheimer's disease model (2015)]([DOI:10.1016/j.cell.2015.01.049](https://doi.org/10.1074/jbc.M113.517540)
[Suárez-Calvet M, Araque Caballero MA, Brendel M, et al, Early increases in sTREM2 biomarker networks preceding tau pathology in Alzheimer's disease (2016)]([DOI:10.1093/brain/aww150](https://doi.org/10.3233/JAD-160452)
[Keren-Shaul H, Spinrad A, Weiner A, et al, A unique microglia type associated with restricting development of Alzheimer's disease (2017)]([DOI:10.1016/j.cell.2017.05.018](https://doi.org/10.1038/s41593-023-01269-7)